PORTLAND — Unitil began upgrading underground gas lines at the corner of Commercial and Market streets today.

Market Street, between Commercial and Fore streets, will be closed to daytime vehicle traffic for about one week, according to a news release from the natural gas company.

Two-way traffic on Commercial Street will be maintained, but some parking spots may be affected. Pedestrian access to buildings will be maintained at all times.

The work is part of the company’s effort to upgrade more than 100 miles of pipe throughout Portland and Westbrook, according to Unitil’s website. It includes the replacement of nearly 70 miles of older cast iron and steel pipe with state-of-the-art plastic.

The work is being done by NEUCO, Unitil’s contractor on the project.

The new pipeline will be more reliable and efficient, and provide greater capacity to meet the growing energy demands of southern Maine residents, according to the website.

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